fgets always returns NULL on stdin

[tedwood]

I'm trying to use fgets to read from a terminal on stdin. Rather than waiting for a return, a full buffer or an EOF it always returns NULL.
When I type a characters in it gets it - sometimes more than one character. Is there a timeout somewhere that I'm not aware of?

Code looks like this n(i.e. it always returns NO_INPUT)

int getLine (char *prmpt, char *buff, size_t sz) {
int ch, extra;

// Get line with buffer overrun protection.
if (prmpt != NULL)
{
printf ("%s", prmpt);
fflush (stdout);
}

if (fgets (buff, sz,stdin) == NULL)
{
return NO_INPUT;
}

if (buff[strlen(buff)-1] != '\n') {
extra = 0;
while (((ch = getchar()) != '\n') && (ch != EOF))
extra = 1;
return (extra == 1) ? TOO_LONG : OK;
}

buff[strlen(buff)-1] = '\0';
return OK;
}

[ESP_igrr]

reads from stdin currently behave as O_NONBLOCK, which is mentioned here:
http://esp-idf.readthedocs.io/en/latest ... out-stderr
The function which reads from the UART gets all the characters present in the FIFO and returns. Blocking reads support is something which needs to be implemented.